Indestructible Debowling Ashtray Hemper silicone debowling caché ashtrays are the perfect ashtray to get rid of your cached dry herbs. When you’re done smoking, instead of dumping your remains into your water pipe chamber, debowl it on this ashtray by turning your glass bowl around and debowling what is left inside on the pointy middle sharp silicone piece in the middle. The Hemper Cache De-bowling Ashtray are made of non-stick heat resistant medical grade silicone. It cleans your bowls and pipes while preventing any buildup on your glass. The durable non-stick silicone material will help extend the life of your glass.